The common symptoms of tenosynovitis of the middle finger include localized pain, swelling, and limitation of finger flexion. 1. Swelling and pain: the symptoms are especially obvious in the early morning, the middle finger shows dysfunction of flexion and extension, the pain can be radiated to the wrist, the interphalangeal joints have obvious pressure pain, and a pea-sized nodule can be felt. The swelling becomes more obvious when the patient is active or cold, and may even spread to the whole palm. 2. Restricted movement: when the patient bends the finger, it can stop suddenly, and the finger shows the symptom of half-bending, as if it is suddenly stuck. When the patient triggers with the other hand, there may be popping and jamming, which is also called “trigger finger” or “popping finger”. When these symptoms occur, you should go to the hospital in time, and the doctor will confirm the diagnosis based on the symptoms and clinical examination.